From e21152358aa0d627ffbbbb12ff2ff5c66aaaa656 Mon Sep 17 00:00:00 2001
From: Bagatur <22008038+baskaryan@users.noreply.github.com>
Date: Fri, 11 Aug 2023 13:58:23 -0700
Subject: [PATCH] fix (#9145)

---
 libs/langchain/langchain/document_loaders/unstructured.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libs/langchain/langchain/document_loaders/unstructured.py b/libs/langchain/langchain/document_loaders/unstructured.py
index 1c729d1e712..b9ed6f8a5d1 100644
--- a/libs/langchain/langchain/document_loaders/unstructured.py
+++ b/libs/langchain/langchain/document_loaders/unstructured.py
@@ -1,7 +1,7 @@
 """Loader that uses unstructured to load files."""
 import collections
 from abc import ABC, abstractmethod
-from typing import IO, Any, Callable, Dict, List, Sequence, Union
+from typing import IO, Any, Callable, Dict, List, Optional, Sequence, Union
 
 from langchain.docstore.document import Document
 from langchain.document_loaders.base import BaseLoader
@@ -39,7 +39,7 @@ class UnstructuredBaseLoader(BaseLoader, ABC):
     def __init__(
         self,
         mode: str = "single",
-        post_processors: List[Callable] = [],
+        post_processors: Optional[List[Callable]] = None,
         **unstructured_kwargs: Any,
     ):
         """Initialize with file path."""
@@ -62,7 +62,7 @@ class UnstructuredBaseLoader(BaseLoader, ABC):
                 unstructured_kwargs.pop("strategy")
 
         self.unstructured_kwargs = unstructured_kwargs
-        self.post_processors = post_processors
+        self.post_processors = post_processors or []
 
     @abstractmethod
     def _get_elements(self) -> List: